Do You Need a Permit to Build a Deck in Ottawa?

In most cases, yes—you do need a building permit to build a deck in Ottawa. The City of Ottawa enforces building permit requirements for decks under specific height, size, and attachment conditions, to ensure that your project complies with safety codes and local zoning bylaws.

This article explains when a permit is required, the application process, and what to consider before beginning your deck construction.

When a Deck Requires a Building Permit in Ottawa

1. Decks Attached to the House

Any deck attached to your home, regardless of its square footage, will generally require a permit if it is more than 600 mm (24 inches) above grade at any point. That’s because attachment to the main structure raises concerns about load-bearing connections, structural stability, and safe access—all of which must meet the Ontario Building Code.

2. Elevated Decks Over 600 mm (24 Inches)

If your deck—whether attached or freestanding—has a walking surface higher than 600 mm (about 2 feet) above the surrounding ground, a permit is required. This elevation threshold is a safety trigger in the building code because it typically requires railings, guard systems, and proper load support.

3. Large Freestanding Decks Over 10 Square Metres

Even freestanding decks that are not attached to your home need a permit if they are:

• More than 600 mm (24 inches) above grade
  
  
• Larger than 10 square metres (about 108 square feet)
  
  

This includes backyard platform decks and raised patio structures. The combination of size and elevation poses enough structural risk to require code compliance and formal inspection.

4. Decks That Provide Principal Access

If your deck serves as a primary entrance to your home (such as front porches or side entryways), a permit is always required if the surface is elevated—regardless of its size. These decks are considered part of the home's functional access and must meet specific egress and safety requirements under the building code.

Permit Exemptions: When You May Not Need a Permit

There are limited circumstances where you can build a deck without a building permit in Ottawa. Your deck may be exempt if it meets all of the following conditions:

• Detached (not physically attached to the house)
  
  
• Less than 10 m² (108 square feet) in surface area
  
  
• Less than 600 mm (24 inches) above the adjacent ground
  
  

However, even if a permit isn’t required, you still must comply with Ottawa’s zoning by-laws, which cover setbacks, height limits, and proximity to lot lines or fences.

To avoid fines or reconstruction, it’s always best to confirm with Ottawa Building Code Services before starting your build.

Application Process: How to Get a Deck Permit in Ottawa

1. Prepare Detailed Plans

You’ll need to submit construction plans that show:

• The deck’s dimensions, height, and total area
  
  
• Location on your property relative to your house and property lines
  
  
• The type of materials being used (e.g., pressure-treated wood, composite)
  
  
• Structural framing details, including beam sizes, joist spacing, and footings
  
  

Drawings should be clear, to scale, and ideally prepared by someone familiar with deck construction.

2. Submit Your Application

Download and complete the Building Permit Application Form. Submit it along with your deck plans to Ottawa Building Code Services, either:

• Online via the city's e-permitting portal
  
  
• In person at your local municipal office
  
  

3. Pay the Permit Fees

Permit fees for decks are typically based on the size and type of structure. For most residential decks, the fee will range from $200 to $500. You can check the current permit fee schedule here.

4. Wait for Review and Approval

Once submitted, your application will be reviewed for compliance with:

• The Ontario Building Code
  
  
• Ottawa’s zoning bylaws
  
  
• Setback, lot coverage, and height restrictions
  
  

Processing times are typically 5–10 business days for straightforward projects.

5. Schedule Required Inspections

After your permit is approved and construction begins, the City of Ottawa will conduct inspections at key stages, such as:

• Post-hole/foundation inspection (before pouring concrete)
  
  
• Framing inspection
  
  
• Final inspection for occupancy clearance
  
  

To book inspections, use the city’s building inspections page.

Why Permits Matter

Safety and Code Compliance

Decks may look simple, but they involve critical safety concerns such as:

• Load-bearing capacity
  
  
• Guardrails and stairs
  
  
• Safe access to the home
  Obtaining a permit ensures your design meets all of the required construction and safety standards set by the Ontario Building Code.
  
  

Avoiding Legal and Financial Issues

Building a deck without a permit can lead to:

• Fines from the City of Ottawa
  
  
• Stop-work orders or forced teardown
  
  
• Insurance claim denials if injuries or damages occur
  
  
• Delays during home sales if buyers request proof of permitted structures
  
  

Permits provide peace of mind that your deck is legal, safe, and fully documented.

Zoning Compliance

Even decks that don’t require a permit must comply with zoning regulations regarding:

• Setbacks from property lines or structures
  
  
• Maximum lot coverage
  
  
• Height restrictions in rear or side yards
  
  

Failing to follow these rules may require costly changes after construction.

Final Thoughts

If you’re planning to build a deck in Ottawa, it’s important to know that a building permit is required in most cases—especially for structures that are attached to your home, elevated more than 24 inches, or larger than 108 square feet. Even if your deck qualifies for a permit exemption, it still must comply with local zoning and safety standards.

To avoid delays, fines, or costly reconstruction, always confirm requirements with Ottawa Building Code Services before you start building.

For a stress-free deck construction experience, consider working with Ottawa General Contractors. Their team handles design, permit applications, and construction—ensuring your deck is not only beautiful but also code-compliant and built to last.

Frequently Asked Questions About Deck Building Permits in Ottawa

Do I Need a Permit to Build a Deck in Ottawa?

Yes, in most cases you do. A building permit is required if your deck is:

• Attached to your house and more than 600 mm (24 inches) above ground
  
  
• Freestanding but larger than 10 m² (108 square feet) and elevated more than 600 mm
  
  
• Serving as principal access to your home and is elevated
  
  

Always check with Ottawa Building Code Services before starting.

Can I Build a Small Deck Without a Permit?

You may not need a permit if your deck is:

• Detached (not connected to your home)
  
  
• Less than 10 m² in size (about 108 square feet)
  
  
• Lower than 600 mm (24 inches) from the ground
  
  

However, even decks that don’t require a permit must still comply with zoning bylaws, including setbacks and lot coverage.

How Much Does a Deck Permit Cost in Ottawa?

Deck permits in Ottawa typically cost between $200 and $500, depending on the size and complexity of the structure. You can find updated pricing in the City’s permit fee schedule.

What Are the Permit Requirements for an Attached Deck?

If your deck is attached to the home and more than 24 inches above grade:

• A building permit is mandatory
  
  
• You must submit detailed construction drawings and a site plan
  
  
• You must meet safety and structural codes from the Ontario Building Code
  
  

What Drawings Are Needed for a Deck Permit?

Permit applications must include:

• Site plan showing the deck’s location in relation to property lines and the house
  
  
• Deck dimensions and height
  
  
• Structural details, including joists, beams, posts, and footings
  
  
• Guardrail and stair details, if applicable
  
  

Drawings should be clear, to scale, and include all framing details.

Are Inspections Required for Building a Deck?

Yes. If your deck requires a permit, the City will perform inspections at:

• Post-hole or footing stage
  
  
• Framing
  
  
• Final completion
  
  

You must pass all inspections to receive final approval. Learn more via the inspection services portal.

Can I Build a Deck Next to My Fence or Property Line?

It depends. Ottawa zoning bylaws regulate:

• Minimum setbacks from side, rear, and front property lines
  
  
• Height limits for structures in certain zones
  
  
• Lot coverage percentages
  
  

Use GeoOttawa to check your property’s zoning, or contact Zoning Services directly.

What Happens If I Build a Deck Without a Permit?

Building a deck without the required permit can result in:

• Stop-work orders
  
  
• Fines or penalties
  
  
• Mandatory removal of the deck
  
  
• Complications during property resale or insurance claims
  
  

Always get proper approvals before you start.

‍